out of depth
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Related to out of depth: couldn't, at a loose end, clear the air, turn up, pick up on, come down to, rubbing off
*out of one's depth
Fig. involved in something that is beyond one's capabilities. (*Typically: be ~; get ~.) You know, you are really out of your depth in this project. I am sure I am out of my depth in organic chemistry.
out of your depth
knowing very little about a subject I know I'm out of my depth with teenagers.